Income Taxes - Reconciliation Between the Effective Income Tax Rates and the Applicable Statutory Rate (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effective Income Tax Rate Reconciliation [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Increases (reductions) resulting from:
State income taxes – net of federal income tax benefit	5.40%	1.90%	1.00%	1.30%
Taxes attributable to noncontrolling interests	15.60%	1.80%	6.90%	2.90%
PTCs and ITCs – NEER	(36.20%)	(7.40%)	(15.30%)	(8.70%)
Amortization of deferred regulatory credit	(14.10%)	(4.40%)	(6.20%)	(5.40%)
Foreign operations	0.70%	0.00%	0.30%	(2.20%)
Other – net	(2.10%)	(2.60%)	(3.40%)	(5.90%)
Effective income tax rate	(9.70%)	10.30%	4.30%	3.00%
FPL [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Increases (reductions) resulting from:
State income taxes – net of federal income tax benefit	2.90%	3.80%	3.70%	4.00%
Taxes attributable to noncontrolling interests	0.00%	0.00%	0.00%	0.00%
PTCs and ITCs – NEER	0.00%	0.00%	0.00%	0.00%
Amortization of deferred regulatory credit	(3.50%)	(5.30%)	(3.50%)	(5.00%)
Foreign operations	0.00%	0.00%	0.00%	0.00%
Other – net	(0.50%)	(0.90%)	(0.70%)	(1.40%)
Effective income tax rate	19.90%	18.60%	20.50%	18.60%

Effective Income Tax Rate Reconciliation, Increases (Decreases), Percent [Abstract]

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[Line Items] for Effective Income Tax Rate Reconciliation [Table]

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Effective Income Tax Rate Reconciliation, Production And Investment Tax Credits

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Topic 740
-SubTopic 10
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-Name Accounting Standards Codification
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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